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Update optional_dependencies.rst #19954

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Update optional_dependencies.rst #19954

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2 changes: 1 addition & 1 deletion service_container/optional_dependencies.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -112,7 +112,7 @@ In YAML, the special ``@?`` syntax tells the service container that the
dependency is optional. The ``NewsletterManager`` must also be rewritten by
adding a ``setLogger()`` method::

public function setLogger(LoggerInterface $logger): void
public function setLogger(?LoggerInterface $logger): void
{
// ...
}
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